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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0598b24016f050fb411fd4e89aa4263d34aa81087adb600de92c6d1cb756df' 
  AND token = 'lcQvtcy1cejapv6Xr4ktmriR5lMMU3b1lPulP1r9tPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}